Re: How can I assign variables
- To: mathgroup at smc.vnet.net
- Subject: [mg22593] Re: How can I assign variables
- From: "Atul Sharma" <atulksharma at yahoo.com>
- Date: Sun, 12 Mar 2000 22:55:35 -0500 (EST)
- References: <8aeju5$3c4@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Try either
In[1]:=
soln = DSolve[B'[t] == (10 - B - T) B, B[t], t]
b[t_] = B[t] /. soln[[1]]
Out[1]=
\!\({{B[t] -> t\ \((10\ B - B\^2 - B\ T)\) + C[1]}}\)
Out[1]=
\!\(t\ \((10\ B - B\^2 - B\ T)\) + C[1]\)
or,
In[2]:=
soln = DSolve[B'[t] == (10 - B - T) B, B, t]
B[t_] = B[t] /. soln[[1]]
Out[2]=
\!\({{B -> \((C[1] + \((10\ B - B\^2 - B\ T)\)\ #1 &)\)}}\)
Out[3]=
\!\(t\ \((10\ B - B\^2 - B\ T)\) + C[1]\)
See section 3.5.10 in the Mathematica book for the difference between asking
DSolve to return B or B[t].
Hope that helps.
Atul
--------------------------------------------------
Atul Sharma MD, FRCP(C)
Pediatric Nephrologist,
McGill University/Montreal Children's Hospital
mark griggs wrote in message <8aeju5$3c4 at smc.vnet.net>...
>How can I do this
>
>If I evaluate the following
> DSolve[B'[t]==(10-B-T) B,B[t],t] I get {{B[t]-> t(10B -B^2 -Bt)
>+C[1]}}
>
>what must I do to have the answer on the right of the -> actually stored
>in B[t] so that I may use it in further calculations without having to
>cut and paste.
>
>regards
>
>mark G
>mathematica 4.0 Linux
>Mandrake 7.0
>
>
>--
>Heisenberg may have slept here
>------------------------------
>